@Rob_Nicholson what I did to get around the issue was remove the buttons toolbar, and remove the preview on the right. Then I centered the editor, made the preview pane optional (it opens on top of the editor on click. The only buttons I needed were the Emoji and the Upload Picture buttons, which I added at the extreme right, making it similar to a phone UI. Most people will just write unformatted text, and for now this should suit you fine.
In a few months, one of us will get around to making a plugin for wysiwyg, so I guess we just have to be patient.